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Red phosphorescent organic light-emitting diodes based on a novel host material with thermally activated delayed fluorescent properties

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  • SPECIAL TOPIC · Molecular Functional Materials and Applications
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Abstract

High cost of phosphors and significant efficiency roll-off at high brightness are the two main factors that limit the wide application of phosphorescent organic light-emitting diodes (PHOLEDs). Efforts have been paid to find ways to reduce the phosphors’ concentration and efficiency roll-off of PHOLEDs. In this work, we reported red emission PHOLEDs with low dopant concentration and low efficiency roll-off based on a novel host material 2,4-biscyanophenyl-6-(12-phenylindole[2,3-a]carbazole-ll-yl)-l,3,5-triazine (BCPICT), with thermally activated delayed fluorescent (TADF) properties. The device with 1.0% dopant concentration displayed a maximum external quantum efficiency of 10.7%. When the dopant concentration was increased to 2.0%, the device displayed a maximum external quantum efficiency of 10.5% and a low efficiency roll-off of 5.7% at 1000 cd/m2.

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Authors and Affiliations

  1. Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Beijing, 100084, China

    Yilang Li, Dongdong Zhang, Yunge Zhang, Minghan Cai & Lian Duan

  2. Department of Chemistry, Tsinghua University, Beijing, 100084, China

    Yilang Li, Dongdong Zhang, Yunge Zhang, Minghan Cai & Lian Duan

Authors
  1. Yilang Li
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  2. Dongdong Zhang
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  3. Yunge Zhang
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  4. Minghan Cai
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  5. Lian Duan
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Correspondence to Lian Duan.

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Li, Y., Zhang, D., Zhang, Y. et al. Red phosphorescent organic light-emitting diodes based on a novel host material with thermally activated delayed fluorescent properties. Sci. China Chem. 59, 684–691 (2016). https://doi.org/10.1007/s11426-015-0506-2

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  • DOI: https://doi.org/10.1007/s11426-015-0506-2

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